Implement kms vaapi capture

include/capture/kms_vaapi.h

@@ -0,0 +1,18 @@
+#ifndef GSR_CAPTURE_KMS_VAAPI_H
+#define GSR_CAPTURE_KMS_VAAPI_H
+
+#include "capture.h"
+#include "../vec2.h"
+#include <X11/X.h>
+
+typedef struct _XDisplay Display;
+
+typedef struct {
+    Display *dpy;
+    const char *display_to_capture; /* if this is "screen", then the entire x11 screen is captured (all displays). A copy is made of this */
+    const char *program_dir; /* ref */
+} gsr_capture_kms_vaapi_params;
+
+gsr_capture* gsr_capture_kms_vaapi_create(const gsr_capture_kms_vaapi_params *params);
+
+#endif /* GSR_CAPTURE_KMS_VAAPI_H */